1. INVESTIGATION OF PROCESSES OF WATER CONSUMPTION BY NATURAL REEDS AND DEVELOPMENT ON ITS BASIS OF THE MATHEMATICAL MODEL OF THE PROCESS
- Author
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M. A. Oleynikova, Vladimir Svintsov, Evgeniya Derbasova, Ruslan Mukanov, and L. V. Boronina
- Subjects
Development (topology) ,Basis (linear algebra) ,lcsh:Construction industry ,Process (engineering) ,Environmental science ,lcsh:HD9715-9717.5 ,Biochemical engineering ,lcsh:Architecture ,Water consumption ,Natural (archaeology) ,lcsh:NA1-9428 - Abstract
Subject: the article considers the possibility of using wild-growing reeds as an effective heat-insulating material in the construction of buildings for various purposes. The main advantages and disadvantages of reeds are analyzed, and it is shown that according to the thermo-technical characteristics cane can be used effectively as a heat-insulating material. Since the thermal conductivity (thermal resistance) of hygroscopic heat-insulating materials depends on their moisture content, a series of experiments was conducted to assess the moisture saturation of natural reeds under conditions of high air humidity. The obtained results were processed to obtain mathematical models for consumption of moisture by reeds during the material exploitation. Research objectives: creation of a mathematical model for calculating the moisture consumption parameters of reed stalks at high humidity parameters of the ambient air. Materials and methods: to achieve the goal, an experimental plant was developed for moistening the reed stalks, in which the samples were kept for several days. Three types of reed stalks were selected: stems with a length of 70 mm and an average diameter of 10 mm: 1 - without leaves; 2 - with leaves along the entire length of the cane; 3 - with leaves and nodal septa. Laboratory samples were brought to the state of their natural weight in the author-developed chamber with infrared heaters in the medium of calcined calcium chloride to absorb the moisture. After conducting the experiments, the moistened reed was weighed to determine the moisture saturation. Results: it has been experimentally confirmed that the curves of moisture saturation of reeds have a nonlinear character. The rate of water absorption in the first two days was 7.9 % for the first type, 8.7 % for the second type and 9.8 % for the third type of reeds. After the first two days the rate of water absorption decreased and after eight days (168 hours) was 15.6 % for samples of the first type, 15.9 % for the second type, and 16.3 % for the third type. Over the next ten days (240 hours), the change in the moisture content of the samples remained practically unchanged and amounted to 16.1 % for the samples of the first kind, 16.6 % for the second type, and 17.3 % for the third type. Conclusions: graphic dependencies of the moisture saturation of reeds on duration of exposure to wet media are obtained; limiting values of moisture content for natural reeds are determined on the basis of experiments; mathematical dependencies of moisture saturation on time are obtained, which can be considered as mathematical models for humidity consumption by natural reeds. more...
- Published
- 2018